My concatenation using this formula is working correctly:
concat(${observer}, "-",${species},"-",${date},"-",${time})
However the time in epoch format is not friendly to quick review.
What formulas or formatting can I use inside this formula to return the epoch value stored in {time} to display in a text box as "YYYY-MM-DD - H:m:s" -- including any corrections for time zone and or origin in 1970?